All Things Moto! Dirtbike Forums  

Go Back   All Things Moto! Dirtbike Forums > Dirt Bike - ATV - Suspension Forums > 4-Stroke Dirt Bike Bike Forums > 4-Stroke Dirt Bikes - Suzuki

LinkBack Thread Tools
Old 01-29-2016, 01:36 PM
Welcome To ATM
Join Date: Jan 2016
Last Online: 01-29-2016 02:31 PM
Location: Salt Lake City, UT
Posts: 1
Default RMZ250 bogging at low RMP... Help! I'm stumped

Hey guys,

I'm new to the game but excited to be here.

I just bought a '08 RMZ250. It bogs at low RPM's. Once you get passed the bogging (if you can) and get on it, it runs strong. If I leave the choke on, it will run okay at low RPM.

I don't know much about these things but I did clean the man jet and the pilot jet with no improvement.

Heres the strange thing- If I turn the carb about 30 degrees to the point where the pilot mixture screw is visible, it runs fine. I'm hoping that will help shed some light what is going on. Could it be a float issue and thats why turning it to the side helps somehow?

Any insight would be amazing. Thanks for the help!
Reply With Quote
Old 02-16-2016, 05:50 PM
Woody_393's Avatar
Age is a state of Mind
Join Date: Dec 2002
Last Online: 04-20-2020 11:52 AM
Location: UTAH
Posts: 29,511

First off welcome to ATM!

It certainly could be the float height and even if it's not, it's a great place to start troubleshooting.

The turning of the carb could fix the float? Your guess is as good as mine.

With the cooler temps here in Utah, you simply may need a richer pilot jet (a size or two bigger).

Both are good place to start. There is more you can try, but that's where I would start.
Reply With Quote
Old 02-16-2016, 06:17 PM
ATM! Addict
Join Date: Jul 2011
Last Online: Today 06:42 AM
Location: Benton, LA
Posts: 5,005

That sure sounds like a float level issue, but also keep in mind that having to run the choke is a sign of being lean without it. As stated go up on the pilot jet and or adjust the fuel screw under the carb float bowl at the front of the That needs to be adjusted daily as the weather changes. Turning the screw CCW makes it richer and CW makes it leaner. Go 1/8 of a turn at a time as this is a very sensitive adjustment. If those don't fix it then you will need to adjust the accelerator pump timing.

Paw Paw
Reply With Quote
Old 02-16-2016, 11:50 PM
Intermediate Class
Join Date: Sep 2009
Last Online: 01-08-2018 01:50 AM
Location: Greece
Posts: 198

How To Set Your Motorcycle Carburetor Float Level (more commentary).
Reply With Quote
Old 02-17-2016, 09:17 PM
Crogg's Avatar
Expert Class
Join Date: Dec 2003
Last Online: 03-14-2019 08:10 PM
Location: Bountiful,Utah
Posts: 570

I would check the fuel pump nozzle and make sure it isn't clogged. If it is shooting fuel then I would look to replacing the lip seal on the floating valve, this is part of the carb slide. The reason the bike runs with the carb twisted is you are compensating for either an air leak (Bad lip seal) or no accel pump fuel (plugged nozzle) with an extemely high float level. I have seen this more times than I can count. Switch to a non ethanol fuel if u haven't already.
Reply With Quote

  All Things Moto! Dirtbike Forums > Dirt Bike - ATV - Suspension Forums > 4-Stroke Dirt Bike Bike Forums > 4-Stroke Dirt Bikes - Suzuki

Thread Tools

Similar Threads for: RMZ250 bogging at low RMP... Help! I'm stumped
Thread Thread Starter Forum Replies Last Post
I'm stumped by my CR125 Bcapo 2-Stroke Dirt Bikes - Honda 17 02-17-2013 06:24 PM
07 rmz250 head and jug on a 06 rmz250?? cbr900oc 4-Stroke Dirt Bikes - Suzuki 0 03-18-2012 09:17 PM
84 IT 200 Stumped dwsracing 2-Stroke Dirt Bikes - Yamaha 12 03-09-2011 05:34 PM
stumped on this bike okayguy General Discussion 2 05-21-2004 08:57 PM
I am stumped,I need help MATTXR250R General Discussion 17 08-27-2003 02:39 PM

All times are GMT -6. The time now is 09:33 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright ©2002-2020, JDub Consulting, Inc. All Right Reserved.